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Table 2 Adjustments of some Rail fasteners used in Beijing subway (unit: mm)

From: Development of the safety control framework for shield tunneling in close proximity to the operational subway tunnels: case studies in mainland China

Type of rail fastener

Adjustment of track gauge

Horizontal adjustment

Adjusting height under rail

Adjusting height under tie plate

DT I

8, −12

10

0

10

DT III

8, −12

25

10

15

DT IV

8, −12

25

10

15

DT V

8, −12

15

0

15

DT VI

8, −12

15

0

15

DT VI1

4, −8

30

0

30

DT VI2

8, −12

30

0

30

DT VII

8, −16

25

10

15

DT VII2

8, −16

40

10

30